The official KB article from VMware shows that this is by design, however if you are using any backup product for your VMware hosts then you should take precautionary steps immediately to avoid your backup data being corrupted.

To ensure the above action is taken on every reverted snapshot, you should also Create a VMware alarmto be triggered on every Snapshot revert action that completes, this will remind your admin to reset CBT data for the VM.

The trigger event for this alarm should be:

The virtual machine state has been reverted to a snapshot

If a backup was taken with incorrect CBT data returned, it is necessary to take a fresh backup set for that VM as this would have caused a corrupted backup set.